It depends on what temperature you HAD and now still have, on what the system workload is when you measure, and on what you expect. I would presume that you are concerned about the CPU temperature, and that is is being controlled automatically by the CPU_FAN header, which is the default configuration. That automatic control system has a pre-set target for temperature as measured by a sensor inside the CPU chip, and what it does is vary the speed of the CPU cooler (fan, formerly, and now the fans on the radiator) to keep that measured temperature on that target. The fact you have not change the settings of that automatic system means it is still trying (and succeeding) to keep that measured temp on that same target. So MAYBE what's really wrong is that you expected something your CPU does NOT need.
Workload is another major factor. At low to medium workloads, that automatic temp control system will achieve its goal (keep close to target) by adjsting the fan speed. But at very high workloads, a poor cooling system at full speed still cannot remove heat fast enough, and the actual measured temp inside the CPU chip will get higher that we want. In that situation, with the cooler running as fast as possible, the autmatic system can do no more. THAT is when changing to a better cooling system, with greater PEAK cooling capcity, will alter the story and keep your CPU close to target temp. Thus, IF you have replaced a limited-capacity cooling system with a better one, the actual impact will he seen mostly when your workload is very heavy, and not a moderate workloads.